664904189 has 8 divisors (see below), whose sum is σ = 670141248. Its totient is φ = 659678400.

The previous prime is 664904179. The next prime is 664904203. The reversal of 664904189 is 981409466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664904189 - 2⁸ = 664903933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664904179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145274 + ... + 149780.

It is an arithmetic number, because the mean of its divisors is an integer number (83767656).

Almost surely, 2^664904189 is an apocalyptic number.

It is an amenable number.

664904189 is a deficient number, since it is larger than the sum of its proper divisors (5237059).

664904189 is a wasteful number, since it uses less digits than its factorization.

664904189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 664904189 is about 25785.7361539282. The cubic root of 664904189 is about 872.8099523018.

The spelling of 664904189 in words is "six hundred sixty-four million, nine hundred four thousand, one hundred eighty-nine".